Ubuntu更新数据源

以下各命令都需要在root用户下执行

1、首先备份Ubuntu12.04源列表
cp /etc/apt/sources.list /etc/apt/sources.list.backup （备份原来的源列表）
2、修改更新源
gedit /etc/apt/sources.list （打开Ubuntu 源列表文件）
3、把里面的列表替换成下面的列表(可以只写入一个源也可以写入多个源)

163源

deb http://mirrors.163.com/ubuntu/ precise main restricteddeb-src http://mirrors.163.com/ubuntu/ precise main restricteddeb http://mirrors.163.com/ubuntu/ precise-updates main restricteddeb-src http://mirrors.163.com/ubuntu/ precise-updates main restricteddeb http://mirrors.163.com/ubuntu/ precise universedeb-src http://mirrors.163.com/ubuntu/ precise universedeb http://mirrors.163.com/ubuntu/ precise-updates universedeb-src http://mirrors.163.com/ubuntu/ precise-updates universedeb http://mirrors.163.com/ubuntu/ precise multiversedeb-src http://mirrors.163.com/ubuntu/ precise multiversedeb http://mirrors.163.com/ubuntu/ precise-updates multiversedeb-src http://mirrors.163.com/ubuntu/ precise-updates multiversedeb http://mirrors.163.com/ubuntu/ precise-backports main restricted universe multiversedeb-src http://mirrors.163.com/ubuntu/ precise-backports main restricted universe multiversedeb http://mirrors.163.com/ubuntu/ precise-security main restricteddeb-src http://mirrors.163.com/ubuntu/ precise-security main restricteddeb http://mirrors.163.com/ubuntu/ precise-security universedeb-src http://mirrors.163.com/ubuntu/ precise-security universedeb http://mirrors.163.com/ubuntu/ precise-security multiversedeb-src http://mirrors.163.com/ubuntu/ precise-security multiversedeb http://extras.ubuntu.com/ubuntu precise maindeb-src http://extras.ubuntu.com/ubuntu precise main

sohu源

deb http://mirrors.sohu.com/ubuntu/ precise main restricteddeb-src http://mirrors.sohu.com/ubuntu/ precise main restricteddeb http://mirrors.sohu.com/ubuntu/ precise-updates main restricteddeb-src http://mirrors.sohu.com/ubuntu/ precise-updates main restricteddeb http://mirrors.sohu.com/ubuntu/ precise universedeb-src http://mirrors.sohu.com/ubuntu/ precise universedeb http://mirrors.sohu.com/ubuntu/ precise-updates universedeb-src http://mirrors.sohu.com/ubuntu/ precise-updates universedeb http://mirrors.sohu.com/ubuntu/ precise multiversedeb-src http://mirrors.sohu.com/ubuntu/ precise multiversedeb http://mirrors.sohu.com/ubuntu/ precise-updates multiversedeb-src http://mirrors.sohu.com/ubuntu/ precise-updates multiversedeb http://mirrors.sohu.com/ubuntu/ precise-backports main restricted universe multiversedeb-src http://mirrors.sohu.com/ubuntu/ precise-backports main restricted universe multiversedeb http://mirrors.sohu.com/ubuntu/ precise-security main restricteddeb-src http://mirrors.sohu.com/ubuntu/ precise-security main restricteddeb http://mirrors.sohu.com/ubuntu/ precise-security universedeb-src http://mirrors.sohu.com/ubuntu/ precise-security universedeb http://mirrors.sohu.com/ubuntu/ precise-security multiversedeb-src http://mirrors.sohu.com/ubuntu/ precise-security multiversedeb http://extras.ubuntu.com/ubuntu precise maindeb-src http://extras.ubuntu.com/ubuntu precise main

ubuntu.cn99.com源

deb http://ubuntu.cn99.com/ubuntu/ precise main restricted universe multiversedeb http://ubuntu.cn99.com/ubuntu/ precise-updates main restricted universe multiversedeb http://ubuntu.cn99.com/ubuntu/ precise-security main restricted universe multiversedeb http://ubuntu.cn99.com/ubuntu/ precise-backports main restricted universe multiversedeb http://ubuntu.cn99.com/ubuntu-cn/ precise main restricted universe multiverse

教育网源
如果你是在校大学生，可以通过教育网，使用某些大学的资源。
电子科技大学

deb http://ubuntu.uestc.edu.cn/ubuntu/ precise main restricted universe multiversedeb http://ubuntu.uestc.edu.cn/ubuntu/ precise-backports main restricted universe multiversedeb http://ubuntu.uestc.edu.cn/ubuntu/ precise-proposed main restricted universe multiversedeb http://ubuntu.uestc.edu.cn/ubuntu/ precise-security main restricted universe multiversedeb http://ubuntu.uestc.edu.cn/ubuntu/ precise-updates main restricted universe multiversedeb-src http://ubuntu.uestc.edu.cn/ubuntu/ precise main restricted universe multiversedeb-src http://ubuntu.uestc.edu.cn/ubuntu/ precise-backports main restricted universe multiversedeb-src http://ubuntu.uestc.edu.cn/ubuntu/ precise-proposed main restricted universe multiversedeb-src http://ubuntu.uestc.edu.cn/ubuntu/ precise-security main restricted universe multiversedeb-src http://ubuntu.uestc.edu.cn/ubuntu/ precise-updates main restricted universe multiverse

中国科技大学

deb http://debian.ustc.edu.cn/ubuntu/ precise main restricted universe multiversedeb http://debian.ustc.edu.cn/ubuntu/ precise-backports restricted universe multiversedeb http://debian.ustc.edu.cn/ubuntu/ precise-proposed main restricted universe multiversedeb http://debian.ustc.edu.cn/ubuntu/ precise-security main restricted universe multiversedeb http://debian.ustc.edu.cn/ubuntu/ precise-updates main restricted universe multiversedeb-src http://debian.ustc.edu.cn/ubuntu/ precise main restricted universe multiversedeb-src http://debian.ustc.edu.cn/ubuntu/ precise-backports main restricted universe multiversedeb-src http://debian.ustc.edu.cn/ubuntu/ precise-proposed main restricted universe multiversedeb-src http://debian.ustc.edu.cn/ubuntu/ precise-security main restricted universe multiversedeb-src http://debian.ustc.edu.cn/ubuntu/ precise-updates main restricted universe multiverse

北京理工大学

deb http://mirror.bjtu.edu.cn/ubuntu/ precise main multiverse restricted universedeb http://mirror.bjtu.edu.cn/ubuntu/ precise-backports main multiverse restricted universedeb http://mirror.bjtu.edu.cn/ubuntu/ precise-proposed main multiverse restricted universedeb http://mirror.bjtu.edu.cn/ubuntu/ precise-security main multiverse restricted universedeb http://mirror.bjtu.edu.cn/ubuntu/ precise-updates main multiverse restricted universedeb-src http://mirror.bjtu.edu.cn/ubuntu/ precise main multiverse restricted universedeb-src http://mirror.bjtu.edu.cn/ubuntu/ precise-backports main multiverse restricted universedeb-src http://mirror.bjtu.edu.cn/ubuntu/ precise-proposed main multiverse restricted universedeb-src http://mirror.bjtu.edu.cn/ubuntu/ precise-security main multiverse restricted universedeb-src http://mirror.bjtu.edu.cn/ubuntu/ precise-updates main multiverse restricted universe

4、更新源
apt-get update